CURVE OF SPEE IN MAMMALS 
173 
of species within the table was made according to the diminishing 
value of the "center angle" of the curve of Spee. The figures given 
in the table were all rounded. 
Table 18 gives for Artiodactyla the mean values of a, 0 and y, the 
mean length of radius of the circle, the mean value of the "center 
angle" of the curve of Spee, the mean value for the angle of the fossa, 
Fig. 4. Diagram Illustrating the Curve of Spee and also the "Center Angle" 
K, middle point of the anterior face of the articular surface of the condyle; a, buccal 
cusp of the first bicuspid; h, mesio-buccal cusp of the third molar; o, center of the circle 
containing the curve of Spee; aoh, the "center angle." 
the mean value of the articular basio-nasal angle, and the mean values 
of the gnathic and dental indices for each species. The arrangement 
of species within the table was made according to the diminishing 
value of the "center angle" of the curve of Spee. The figures given 
in the table were all rounded. 
